The best whip float for fishing on the drop ever made is a reversed crowquill. If you want to make one strip the hurl off of a Crow's wing feather with fine emery cloth (about 180 grit) , cut to six inches. Push the fat end into a small silicon float adaptor. Shot either side with a couple of No1 or bb shot , one or two no8 styls for droppers. Small ones for 3m, larger up to 6m.